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Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues: |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | $ 125,723 us-gaap_InterestAndDividendIncomeOperating | $ 124,538 us-gaap_InterestAndDividendIncomeOperating | $ 131,896 us-gaap_InterestAndDividendIncomeOperating
Net realized investment gains (losses) |  |  |  |  |  |  |  |  | 81,184 us-gaap_RealizedInvestmentGainsLosses | (11,422)us-gaap_RealizedInvestmentGainsLosses | 66,380 us-gaap_RealizedInvestmentGainsLosses
Total revenues |  |  |  |  |  |  |  |  | (3,011,773)us-gaap_Revenues | (2,821,041)us-gaap_Revenues | (2,783,370)us-gaap_Revenues
Expenses: |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | 249,381 us-gaap_OtherCostAndExpenseOperating | 219,478 us-gaap_OtherCostAndExpenseOperating | 207,281 us-gaap_OtherCostAndExpenseOperating
Other operating expenses |  |  |  |  |  |  |  |  | 2,637 us-gaap_InterestExpense | 1,260 us-gaap_InterestExpense | 1,543 us-gaap_InterestExpense
Total expenses |  |  |  |  |  |  |  |  | 2,764,348 us-gaap_BenefitsLossesAndExpenses | 2,688,945 us-gaap_BenefitsLossesAndExpenses | 2,648,060 us-gaap_BenefitsLossesAndExpenses
Income before income taxes | 28,161 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (37,120)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (136,436)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (102,030)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (11,268)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (54,793)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 24,959 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (90,994)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (247,425)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (132,096)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (135,310)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax (benefit) expense |  |  |  |  |  |  |  |  | 69,476 us-gaap_IncomeTaxExpenseBenefit | 19,953 us-gaap_IncomeTaxExpenseBenefit | 18,399 us-gaap_IncomeTaxExpenseBenefit
Net income | (20,956)us-gaap_NetIncomeLoss | 31,296 us-gaap_NetIncomeLoss | 94,960 us-gaap_NetIncomeLoss | 72,649 us-gaap_NetIncomeLoss | 15,376 us-gaap_NetIncomeLoss | 39,570 us-gaap_NetIncomeLoss | (9,264)us-gaap_NetIncomeLoss | 66,461 us-gaap_NetIncomeLoss | 177,949 us-gaap_NetIncomeLoss | 112,143 us-gaap_NetIncomeLoss | 116,911 us-gaap_NetIncomeLoss
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 4,478 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,293 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,114 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net realized investment gains (losses) |  |  |  |  |  |  |  |  | (9,428)us-gaap_RealizedInvestmentGainsLosses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,416 us-gaap_RealizedInvestmentGainsLosses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 697 us-gaap_RealizedInvestmentGainsLosses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total revenues |  |  |  |  |  |  |  |  | (4,950)us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4,709)us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,811)us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Expenses: |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | 5,971 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,924 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,688 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other operating expenses |  |  |  |  |  |  |  |  | 1,746 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 318 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total expenses |  |  |  |  |  |  |  |  | 7,717 us-gaap_BenefitsLossesAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,242 us-gaap_BenefitsLossesAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,688 us-gaap_BenefitsLossesAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income taxes |  |  |  |  |  |  |  |  | (12,667)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,467)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (123)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (100)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,310 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,800 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Loss before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (12,567)mcy_LossBeforeEquityInNetIncomeLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,843)mcy_LossBeforeEquityInNetIncomeLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,677)mcy_LossBeforeEquityInNetIncomeLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 190,516 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 113,986 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 118,588 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income |  |  |  |  |  |  |  |  | $ 177,949 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 112,143 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 116,911 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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